The AUDI A6 (2004-09) 4DR SALOON 3.0 TDI QUATTRO S LINE is a large, premium four-door diesel saloon, aimed at buyers wanting more space and comfort than a family hatchback. In the UK used-car market, it sits among executive cars such as the BMW 5 Series and Mercedes-Benz E-Class, offering an alternative. mycarcheck.com records 41 look-ups covering 22 distinct VINs, giving a useful snapshot, though not a full measure of every car. The average recorded mileage is 170,000, with annual mileage of 9,000; cars had around 4.8 previous keepers on average. The average private-sale valuation was £1,200, so condition and history deserve particular attention. With its S line styling and Quattro four-wheel drive, this A6 is known for a confident, composed feel and reassuring grip in poor weather. It suits longer-distance commuters and families seeking a spacious, comfortable cruiser, rather than drivers prioritising low running costs. Compare service records before buying.